Air-brake-piston-packing expander.



J. OS MER. AIR BRAKE PISTON PACKING EXPANDER.

APPLICATION PIFLED MAR. 27, 1911.

1,03 8, 116. Patented July 23, 1912.

WITNESSEE- |NVENTDRQ A FT-"III R N l-ziY STAT-Es PATENT OFFICE.

MILWAUKEE, WISCONSIN, A CORPORATION or NEW 'JOHN E. OSMER, OF BOONEQ IOWA, ASSIGNOR TO- ALLIS-CHALIVIEBS COMPANY, OF

JERSEY.

' AIR-BRAKE-PISTON-PACKING EXPANDER.

-.Specification of Letters Patent.

- Application filed March 27, 1911. Serial No. 617,035,

Be it known that .1, JOHN E. mm, a citizen of the United States, residing at Boone, in the county of Boone and State of Iowa, have invented a certain new-and useful Improvement in Air-Brake-Piston-Paking Expanders, of. which the following is ;a specification.

This invention relates to packing expanders for pistons, and is particularly adapted for use on pistons in the cylinders of air brakes.

The present inventio n is an improvement on the construction shown in United States Patent No. 862,5%10, dated Aug. 6, 1907, granted to George Christensen, and that shown in the Unite d'States Patent- No.

924:,087, dated June 8, 1909, granted to John Emory Meek, and is the same invention as that of United States Patent No. 984,888; dated February 21, 1911,, granted to said Christenson.

In a packing expander for air brake pistons of the general character shown in the.

earlier Christensen patent, it is desirable,

both for economy of material, and for reasons of adaptability to existing structures, to 'make the flange portion as thin as possible,

" as set out in the patent to Meek above noted.

But inorder to secure the highest degree of j elasticity and resiliency in the completed Jstructure, it is necessary to use a highly tempered steel, and such highly tempered steel can not conveniently be drawn down to the thin flange desired, whenthe structure is V made, integral by the process of drawing 1 economical methods of manufacture. avoidthe difficulties arising from these conflicting conditions the present composite through a die or rolling same, which are To h which:

. Figure 1 is a perspective view of the expander ring, and Fig. 2 is a cross.sect1on on the line III'I of a fragment of the ring shown in Fig.1 looking in the direction of the'a'rrow.v

Throughout the drawings like reference characters indicate like parts.

The ring 20f highly tempered steel, preferably, of circular cross section may he formed by cutting the required length from a steel rod of the propersize and bending I .are preferably fastened to them by bending portions 3, 4:, on the edges of the strip about the rings 2, 5, respectively, as shown in the drawings. Preferably the abutting ends of the circular structure so formed are cutvin step form looking in the planeof the ring toward the center, the upright portions 6 of 'one of the ends'being connected by the longitudinal portions 7, as indicated in Fig. 1.

The advantages of this invention include the production at a low cost of a packing expander having the highestresiliency-and the thinnest possible flange; The flange be.- ing'formed of metal of low temper will bend without breaking, so that the possibilities of destruction in use and handling are decreased, as well as those in manufacture.

Patented July 23, 1912 Various changes in shape and proportions of parts could be made without departing from the principle of this invention. In some cases the rings 2., 5, or e1tl161 0f them,

might be omitted if the remaining structure .produce exactly the graduated degree of resiliency-desired for 'difierent sizes of cylinder and" difierent degrees of air pressure, while it wouldbe'practically diflicult, if not impossible, to give a, very-high temper to. the thin strip 1 and then bend it or draw it into the shape required. w

It is claimed and desired to secure by Letters Patent: p y 1. A composite piston packing expander ring comprising a strip of sheet metal bent into a circle with abutting disconnected ends, and having its side edge portions curved back uponthemselves and each of said curved portions enwrapping' a wire 'ef circular cross section, the remaining portion of said strip'extending at right angles to the plane of said ring.

2. It piston packing expander having in combination a thin strip of sheet material bent into a ring with abutting ends, and two rings of elastic materiallocated within said tirst mentioned ring.

3. A piston packing expander having in eombii'iation a thin strip of sheet material bent into a ring with abutting ends, and two rings of elastic material located within said first mentioned ring, one edge of said strip being bent around one of said rings.

L. A piston packing expander having in combination a thin strip of sheet material bent into a ring with abutting ends, and two rings of elastic material located within said first mentioned ring, one edge of said strip being bent around one of the rings'and the other edge of the strip being bent around the other ring.

A piston packing expander having in" combination a thin strip of sheet material bent into a'rmg with abutting ends, and two rings of elastic material located within said first mentioned ring, one edge of said strip being attached to one of said rings.

G. A piston packing expander having in combination a thin strip of sh'eet; material bent into a ring with abutting ends, and two rings of elastic material located within said first mentioned ring, one edge of said strip being attached to one of said rings and the other edge of said strip. being attached to the other of said rings.

7. A piston packing expander having in combination a thin strip of sheet material bent'into a ring with abutting ends, and two rings of elastic material located within said first mentioned ring, the main portion of the strip being arranged at right angles to the plane of the rings.

8. A piston packing expander having in combination a thin strip of sheet material. bent into a ring with abutting ends, and two rings of elastic material located within said first mentioned ring, one edge of said strip being attached to one ring, and the main portion of the strip being arranged at right angles to the plane of the rings;

9. A piston packing expander, having in combination a thin strip of sheet material bent into a' ring with abutting ends, and two rings of elastic material located within said first mentioned ring, one edge of said strip being attached to one ring, and the said elastic rings also having abutting ends.

In testimony whereof, the signature of the inventor is attixed hereto in the presence of two witnesses.

JOHN E. OSMER,

Vitnesses: i A. B. SIL InAx,

V. E. Donna. 

